My wife and I stayed at Kawiwan's apartment for four nights. It was perfect for our needs as it was well located in a more upmarket part of Bangkok (there are quite a lot of embassies around) but within a 20 min walk of some night life if desired.
While we didn't get a chance to meet Kawiwan face-to-face, she was very responsive to all requests and questions. We checked in at about 10 pm and it was simple as the key was left with the security guard downstairs.
The proximity to the freeway has been mentioned in other comments and while you can hear it, we didn't find it instrusive at all.
Overall we found it a very good experience and would certainly recommend the apartment to others.
Thanks Kawiwan